204 R. T. BAKER AND H. G. SMITH. 



The small amount of pinene present was dextro-rotatory, 

 and so differs from the laevo-rotatory form found in most 

 kinds of ordinary "cajuput." The oil does not, therefore, 

 meet the demands for rotation in the American Pharma- 

 copoeia. This constant, however, is of minor importance, 

 and is omitted in the British Pharmacopoeia. The some- 

 what high dextro-rotation of the crude oil (+7*2°) is mostly 

 due to the stearoptene, which constituent influences the 

 rotation more than does the pinene. 



Schimmel & Co., 1 give the following results, obtained 

 with the oil of this species, sent to them from Adelaide, 

 South Australia, in 1892. Specific gravity 0*925. Optical 

 rotation + 1° 40'. Mostly distilled between 175° and 180°O. 

 Rich in cineol. The highest boiling portion probably con- 

 sists of terpineol. No information as to yield of oil is given. 



In the Technologist for 1863, p. 28, it is recorded that 

 an oil was obtained from plants, stated to be this species, 

 from the Botanic Gardens, Melbourne. The material was 

 collected in November. The specific gravity of the oil was 

 0*920. Only 1*75 ounces of oil was obtained from 100 

 pounds of fresh leaves and branchlets. This is a remark- 

 ably small yield, particularly as the leaves of M. uncinata 

 contain numerous oil glands. The yield we have obtained 

 is more than ten times as great. 



The Solid Alcohol. — The whitish crystalline mass, 

 obtained as previously stated, was dissolved in a consider- 

 able amount of alcohol, and water slowly added until the 

 oily portion separated. After standing, this was filtered 

 off and allowed to crystallise, when is was again spread on 

 porous plates as before. The filtrate was poured into a 

 large quantity of water and allowed to crystallise. The 

 crystals soon formed, interlacing each other in needles, pro- 

 ducing a white bulky mass. This was filtered off and spread 



1 The Volatile Oils, p. 523.- 



